| Project/Area Number |
17540418
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | National Institute of Polar Research |
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Principal Investigator |
MORIMOTO Shinji National Institute of Polar Research, Division of Research and Education, Research Associate, 研究教育系, 助手 (30270424)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAZAWA Takakiyo Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (30108451)
AOKI Shuji Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (00183129)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2005: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Carbon Cycle / Greenhouse gas / Oxygen Concentration / Carbon Dioxide |
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| Research Abstract |
Since variations of atmospheric O_2 concentration are closely related to the global carbon cycle, precise measurements of the O_2 concentration on the order of parts per million will give us a new constraint on the global CO_2 balance research. We have developed a high-precision, continuous measurement system of the atmospheric O_*2 concentration to start an in-situ O_2 measurement at Syowa Station, Antarctica.
To improve measurement reproducibility of a commercially available 0_2 analyzer, we at first tried to reduce variations of 0_2 molecule number at the 0_2 sensor by controlling temperature and pressure of the sample air flow. Then, shape and materials of the air sample path were carefully selected to avoid the 0_2 concentration change before analysis. Further, water vapor contained in the sample air was removed by passing the air sample through a Pyrex glass water trap kept at-90°C. At the same time, to reduce the 02 concentration change when the air sample passing the water trap, an active pressure regulation was inserted into the air sample line. Finally, the reproducibility of our 0_2 measurement system reached 0.5-0.8 ppmv. To install the system into Syowa Station, Antarctica, we will make test measurements of the atmospheric 0_2 concentration at Sendai to finalize the development.
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